feat: note templates per type (💡 Note templates per tipo) (#170)

* feat: add template field to type entries and template-aware note creation

- Rust: add template field to Frontmatter, VaultEntry, SKIP_KEYS
- Rust: support YAML block scalar (|) for multi-line strings in frontmatter
- Rust: fix value continuation detection to handle block scalars properly
- TypeScript: add template to VaultEntry, buildNewEntry, frontmatterToEntryPatch
- Add DEFAULT_TEMPLATES for Project, Person, Responsibility, Experiment
- resolveNewNote/buildNoteContent accept optional template parameter
- handleCreateNote and handleCreateNoteImmediate look up type template
- Tests for all new behavior (Rust + TypeScript)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* feat: wire template UI through Sidebar and App, add TypeCustomizePopover template section

- Add template textarea with debounced save to TypeCustomizePopover
- Wire handleUpdateTypeTemplate through useEntryActions → Sidebar → App
- Add useDebouncedCallback hook for 500ms template save debounce
- Add tests for handleUpdateTypeTemplate and TypeCustomizePopover template UI
- Create design/note-templates.pen placeholder

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: useRef type arg + template field in bulk mock entries

* style: rustfmt

---------

Co-authored-by: Test <test@test.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

src/hooks/useNoteListKeyboard.test.ts

@@ -22,6 +22,7 @@ function makeEntry(path: string, title: string): VaultEntry {
     fileSize: 100,
     color: null,
     icon: null,
+    template: null,
     outgoingLinks: [],
     relationships: {},
   }